A page of the Numeropedia - the Special Encyclopedia of Numbers
[Math.] A triangular number (sum of all integers from 1 to 35): 630 = 1+2+…+34+35.
[History] The height and the span (feet) of the stainless steel arch “Gateway to the West”, in St. Louis, Missouri, was built from 1963 to 28 October 1965, a monument of the National Westward Expansion. It was designed by Finnish-American architecture Eero Saarinen.
[Phone] By NANPA/U.S. rules, the number of 3-digit area codes available is 630. They excudes the numbers n11, n22, n33, n44, n55, n66, n77, n88, n99, n9x, 37x and 96x, and n cannot be 0 or 1. (NANPA: North American Numbering Plan Administration).
[World] The ISO country code for Puerto Rico. (ISO-3166)
[Math.] A prime number.
[Math.] 6313+4613+1933 = 356,400,829 = 7093. The smallest prime whose cube is sum of 3 different cubes of prime numbers.
[Math.] 6333 = 253,636,137 = (2–5+3+636+1+3–7)3.
[World] The ISO country code for Qatar. (ISO-3166)
[Math.] 6354 = 16,25,9,0400,625 is a concatenation of square numbers.
[Math.] 6373 = 258,474,853 = (258–474+853)3.
[Trivia] Documentary and book, “638 Ways to Kill Castro”.
[World] The ISO country code for Reunion. (ISO-3166)
[Math.] Sum of prime numbers up to 71 is 639, which is divisible by 71.
[Library] Numbers 600-699 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Applied Sciences and Technology (Medicine, Agriculture and Engineering…). Numbers 630-619 are for books in Agriculture and Hunting, Fishing…